Set page.viewportSize on the PhantomJS webpage object before calling page.open(). Give it numeric width and height values; after the page opens successfully, call page.render() to save the screenshot.
Set the viewport before opening the page
This complete PhantomJS script sets a 1024-by-768 viewport, opens a page, and saves a PNG only if navigation succeeds:
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var page = require('webpage').create();
page.viewportSize = {
width: 1024,
height: 768
};
page.open('https://example.com/', function (status) {
if (status === 'success') {
page.render('capture.png');
}
phantom.exit();
});Save it as capture.js and run it with your PhantomJS executable, for example phantomjs capture.js. The dimensions are examples, not a required standard; choose the width and height for the browser window or responsive layout you need to emulate. PhantomJS documents viewportSize as setting the viewport used for page layout, effectively simulating a traditional browser window. PhantomJS viewportSize reference
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The viewport influences layout. Assigning it before page.open() lets the page lay out at the requested dimensions as it loads. Include both properties: the API reference specifically requires height as well as width.
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Choose layout size separately from capture bounds
page.viewportSize controls the viewport used to lay out the page. page.clipRect specifies the rectangle rasterized into the output image. They are related but not interchangeable.
page.viewportSize = { width: 1024, height: 768 };
page.clipRect = { top: 0, left: 0, width: 1024, height: 768 };Use matching values when you want an image of that viewport-sized region starting at the top-left. Set a different clip rectangle when you specifically want a crop. For an entire page, use PhantomJS’s full-page rendering behavior rather than assuming that increasing viewport height alone defines the final image bounds. PhantomJS screen capture guide
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Render only after navigation succeeds
page.open() reports a status to its callback. Render in the success branch, as in the example, so a failed navigation does not produce an output you mistake for a valid capture.
The PhantomJS documentation shows a 200 ms timeout after opening as an example, but that is not a universal page-readiness interval. A fixed delay may be too short for a slow page or unnecessarily long for a fast one; the documentation does not establish a site-independent wait time. If a script needs to wait for site-specific content, add a condition suited to that page rather than treating 200 ms as a guarantee.
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Select an output format by filename
PhantomJS infers the output format from the filename passed to page.render(). For example, capture.png produces PNG and capture.jpg requests JPEG. The API reference lists PDF, PNG, JPEG, BMP, and PPM; GIF support depends on the Qt build. PhantomJS render reference
Troubleshoot common capture problems
- The page uses the wrong responsive layout: confirm that both
widthandheightare numeric and thatpage.viewportSizeis assigned beforepage.open(). - The image is cropped or has unexpected bounds: inspect
page.clipRect. It controls the captured rectangle; the viewport controls layout. - The output is blank or represents a failed load: check the
statuspassed to thepage.open()callback and render only when it issuccess. - Dynamic content is missing: a successful open does not by itself establish that every site’s later content has finished rendering. Do not rely on the documentation’s example 200 ms delay as a universal readiness test.
- The requested image format is unexpected: verify the extension passed to
page.render(); format is inferred from the filename.
Account for PhantomJS’s project status
The PhantomJS homepage states, “Important: PhantomJS development is suspended until further notice.” Its API documentation remains useful for maintaining existing scripts, but the documented behavior is not evidence of compatibility with current websites or browser engines beyond PhantomJS itself. PhantomJS official homepage
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If you need a screenshot without maintaining a PhantomJS script, ScreenshotNeo is a website screenshot API. One GET request can return an image or PDF; its capture can accept a consent banner as a visitor and remove known consent platforms, newsletter popups, and chat widgets before the shot. Each of those cleanup steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and response headers report the page verdict and billing status.
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For a quick test, replace the example target URL and supply your API key. See the ScreenshotNeo documentation for request options and response details.
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